Nearly every aspect of astronomy is related in some way to the existence of gravity and to the motions which are responsible for a balance against gravity
How does this balance play a role for the miscellaneous objects of the solar system (i.e., the asteroids and comets)? How can some aspect of this be used as a tool to determine masses in the solar system?
Asteroids and comets all orbit the Sun, some with highly eccentric orbits. Some comets have periods of millions of years. Gravity acting on and between comets and asteroids can be used to determine their masses and the masses of bodies affecting them.
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Land subsidence is generally not reversible because
A) compacted clay layers cannot be expanded. B) once pumping is stopped, layers continue to compact. C) compacted sandy aquifers cannot be expanded. D) none of the above
How can we be certain that white dwarfs are very small?
What will be an ideal response?
Waves arriving at a fixed boundary are
a. neither reflected nor inverted. b. reflected but not inverted. c. reflected and inverted. d. inverted but not reflected.
When a positive charge q is placed in the field created by two other charges Q1 and Q2, each a distance r away from q, the acceleration of q is
a. in the direction of the charge Q1 or Q2 of smaller magnitude. b. in the direction of the charge Q1 or Q2 of greater magnitude. c. in the direction of the negative charge if Q1 and Q2 are of opposite sign. d. in the direction of the positive charge if Q1 and Q2 are of opposite sign. e. in a direction determined by the vector sum of the electric fields of Q1 and Q2.